Drilling mechanism



May 27, 1930. c. F. osGooD DRILLING MECHANISM Filed March 13, 1924Patented May 27, 1930 UNITED STATES PATENT FFICEv CHARLES '.E. OSGOOD,0F CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MA- CHINERY COMPANY, ACORPORATIGN OF MASSACHUSETTS i DRILLING MEGHANISM Application filedlMarch 13, 1924. Serial No. 699,122.

This invention relates to drilling mechanism.

An object of my invention is toV provide an improved drilling mechanism.Another object is to provide an improved drilling mechanism in which isembodied feeding mechanism, a tool rotation mechanism, automatic meansfor controlling the feeding mechanism which is responsive to variationsin the resistance to rotation of a tool, and a hammer piston. A furtherobject of the in-v ventionis to provide an improved means forcontrolling. the same. Another ob] ect of my invention is to provide animproved manual i controlling means comprising a plurality of partlybroken away to show details of construction.

Fig. 2 is an enlarged longitudinal transverse fragmentary section takenon line 2-2 of Fig. 1.

Fig. 3 is a horizontal transverse section on line 3-3 of Fig. 1.

Fig. 4 is a detail sectional view of the manual controlling valves.

In the illustrative form of my invention I have shown the same embodiedin a stoper type of drill which comprises the usual motor cylinder 1having at its upper end a steel receiving chuck 2 rotatably mounted in achuck housing 3 carried on the forward end of the cylinder, the steel 4and chuck 2 being rotated as by a gear 5 mounted upon a rotatable shaft6, the lower end of which carries one of two intermeshing rotation motorrotors 7 adapted to be actuated by a suitable source of fluid supplycontrolled by a main control valve 8 rotatably mounted in the head 9carried on the lower end of the motor cylinder 1. `Projecting downwardlyfrom, the head 9 and positioned coarially with the axis of the motor 1is a feed cylinderV 10 within which is slidably mounted a piston andpiston rod 11 and 12 respectively, the latter having non-rotatableengagement with the cylinder 10 as by alie 13 and terminating in a twopoint swivele foot piece 14., rIhe key 13 is desirable in view of thefact that part of my mechanism to be describedl is controlled byresistance to rotation of the tool.

The particular means for `controlling the feed so that' the controlthereof will be responsive to variations in the resistance to steelrotation comprises a valve 15 disposed, herein shown astransversely, butwhich could be in any direction desired, in a bore 16 formed lin thehead 9, theouter ends of which terminate in enlarged bores 17 and 18respectively closed by plugs 19 and 20. More specifically,A the valve 15has anr annular groove 21 Vformed in` the periphery ofk the maincylindricalv portionA thereof and from.-

which a stem 22 projects to carry a conical shaped valve member 23 whichhas flat portions 24 thereon to allow a certain amount of fluid toflowas-will be hereafter described. The opposite end of the valve 15 carriesan enlarged piston 25 reciprocably mounted' within the bore 18 and saidvalve isv held in substantially balanced condition as by a spring 26'surrounding a stem 27projecting outwardly from the piston 25. The valvestructures@vv far described is capable of cooperation with vsuitablepassage means to decrease or shut down the flow ofactuating fluid tothefeed cylinder and to increase the flow of fluid to the rotation motor asthe resistance to' rotation of the tool lincreases. To accomplish thisfunctionv a passage 28A communicates with the main control valve andvterminates in the supply chamber 17 A passage 29 communicates with saidsupply chamber and the feed' cylinder `as by the annular groove 21 inthe valve 15?, the latter being in the position shown in Fig. 2, and thevalve the tool. At the sam-e time iuid will iiow from the chamber 17past the flattened portibns 24 and through passage 30 to the inletchamber 31 of the rotation rotors 7. Communicating with the chamber 31is a passage 32 leading to the chamber 18 on the outer side of thepiston 25. rIhe fluid for actuating the hammer piston may be controlledoy any suitable port means in the main control valve 8, but in order to.control the feed and rotation independently thereof, I have provided avalve 33 longitudinally movably and centrally disposed in the maincontrol valve 8 which is adapted to control flow of fluid through a port3e and annular groove 35 which in turn controls the flow of fluidthrough passage 28 leading to the constant fluid supply chamber 17. rlhecentral valve 33 is actuated by a trigger lever 36 pivotally mountedupon the main or throttle lever 37. Rotation of the main control valve 8can permanently disconnect tl e annular groove 35 and the passage 28 forcompletely shutting down the drill.v If, however, it is desired to shutoff only the feed and rotation mechanisms, the trigger controlled lever36 may be instantlyA actuated.

In the operation, assuming the motor hammer piston to be running andwith pressure fluid flowing throughk passages 29 and 30, respectively,tothe feed and rotation mecha isms causing the same to be actuated, asresistance to rotation of the tool 4 varies, such for instance that itshould increase above normal, caused by being caught in a seam, or otherreasons, the rate of rotation of rotors 7 will decrease which willreduce the amount of air consumed, thereby with a resultant increase ofpressure in the chamber 31. Dur-- ing normal operation, fluid to thefeed cylinder would flow through passage 29 and annular groove 21thereto, but when pressure flowing from the passage 30 is built up in`chamber 31 as mentioned, the same is trans-y mitted through passage 32to chambery 18 to u. cause movement of valve 15 in a left hand directionthereby partially restricting or shutting olf the passage29 and cuttingdown or preventing further flow of actuating fluid to the feedingmechanism. However, on

l said movement, the conical valve portion 23 will be moved away fromits seat and with the aid of the flattened portions 24 more air will beallowed to flow through the passage 30 to :the rotation motor, therebycausing greater rotative force to be exerted upon the tool 4. U on adecrease of resistance to rotation, p essure for actuating the rotationrotors 7 will be decreased with a resultant decrease of pressure in thechamber 18 and moving of the `valve 15 to its right hand position untilthe pressure within the chamber 17, acting upon the outer end of thevalve 15 is equal to the pressure in the chamber 18 plus the pressure ofthe spring 26. It will herein also be noted that when the supply ofpressure fluid to the stantially no air is wasted in controlling the.

feed for I decrease or shut the supply off and the feed cylinder isvented to atmosphere only when desired as by a usual bleed port in thevalve 8. Also by my improved construction I not only have automaticcontrol of the feeding` but also an instantly operable manual control sointer-related with respect to the automatic means that instant controlcan be had of only the most vital elements such as the rotation andfeeding.

l/Vhile I have in this application specifically' described one formwhich my invention may assume in practice, it will be un derstood lthatthis form of the same is shown for purposes of illustration and that theinvention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claim.

. VV hat I claim as new and desire to secure by Letters Patent is: f

The combination in a drilling mechanism comprising a tool, rotationmeans therefor actuated by fluid pressure, fluid actuated feeding meansfor said tool, and means responsive to the resistance to rotation of-said tool for automatically shutting down the flow of fluid to saidfeed andV increasing the flow CHARLES r. o'sGooD.

